Ceramic shell mould used for beryllium aluminium alloy, and preparation method thereof

The invention relates to a ceramic shell mould used for beryllium aluminium alloy, and a preparation method thereof. The ceramic shell mould used for beryllium aluminium alloy is composed of a surface layer, a transition layer, and a reinforced layer; the surface layer is prepared by taking calcined alumina powder with a granularity of 300 to 325 meshes, and alumina sand with a granularity of 80 to 120 meshes as raw materials; the transition layer is prepared by taking mulgrain powder with a granularity of 200 to 225 meshes, and mulgrain sand with a granularity of 25 to 36 meshes as raw materials; the reinforced layer is prepared by taking mulgrain powder with a granularity of 200 to 225 meshes, and mulgrain sand with a granularity of 10 to 16 meshes as raw materials. According to the ceramic shell mould, alumina and mulgrain sand which possess no toxicity, and are cheap are taken as raw materials, so that the obtained ceramic shell mould possesses no toxicity, is safe and reliable, possesses high temperature resistance, high strength, and high stability, and no pollution is caused. The materials are low in cost, so that raw material cost and protection cost are reduced greatly; the preparation method is simple; process flow is short; production cost is low; and stability and finished product yield of obtained beryllium aluminium alloy products are high.